Yeah, 5, but make sure it's wired correctly. The 5th (brake release) wire needs be wired into your reverse lights so you can back up. If not, the brakes will lock up and you can't launch! Saw a few "do it yourselfers" at the ramp one time skidding backwards down the ramp cause they didn't wire it right! LOL You can have a ball just sitting at a public launch and watching the stupidity of humanity unfold before your eyes. Scary part is once they actually launch....somewhere, that guy is out on the water with a boat!